DM74LS47 BCD to 7-

October 1988
Revised March 2000

DM74LS47
BCD to 7-Segment Decoder/Driver with
Open-Collector Outputs
General Description Features

Segment Decoder/Driver
The DM74LS47 accepts four lines of BCD (8421) input ■ Open-collector outputs
data, generates their complements internally and decodes ■ Drive indicator segments directly
the data with seven AND/OR gates having open-collector
■ Cascadable zero-suppression capability
outputs to drive indicator segments directly. Each segment
output is guaranteed to sink 24 mA in the ON (LOW) state ■ Lamp test input
and withstand 15V in the OFF (HIGH) state with a maxi-
mum leakage current of 250 A. Auxiliary inputs provided
blanking, lamp test and cascadable zero-suppression
func-tions.

Ordering Code:
Order Number Package Number Package Description

with Open-Collector Outputs

DM74LS47M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS47N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbol Connection Diagram

VCC  Pin 16
GND  Pin 8

Pin Descriptions
Pin Names Description
A0–A3 BCD Inputs
Ripple Blanking Input (Active LOW)
RBI
Lamp Test Input (Active LOW)
LT
BI/RBO Blanking Input (Active LOW) or
Ripple Blanking Output (Active LOW)
a –g Segment Outputs (Active LOW) (Note 1)
Note 1: OC—Open Collector

© 2000 Fairchild Semiconductor Corporation DS009817 www.fairchildsemi.com

Logic Diagram

DM74LS47
Numerical Designations—Resultant Displays
 www.fairchildsemi.com
DM74LS47

Absolute Maximum Ratings(Note 6)

Note 6: The “Absolute Maximum Ratings” are those values beyond which
Supply Voltage 7V the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical

Operating Free Air Temperature Range 0°C to +70°C The “Recommended Operating Conditions” table will define the conditions
for actual device operation.

Recommended Operating Conditions

Symbol Parameter Min Nom Max Units
V
CC Supply Voltage 4.75 5 5.25 V
V
IH HIGH Level Input Voltage 2 V
V
IL LOW Level Input Voltage 0.8 V
I
OH HIGH Level Output Current

I
OH HIGH Level Output Current BI /RBO −50 µA
I
OL LOW Level Output Current 24 mA
T
A Free Air Operating Temperature 0 70 °C
Note 7: OFF-State at a–g.

Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol Parameter Conditions Min (Note 8) Max Units

VI Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V

V
OH HIGH Level VCC = Min, IOH = Max,

I
OFF Output HIGH Current Segment Outputs VCC = 5.5V, VO = 15V a − g 250 µA
V
OL LOW Level VCC = Min, IOL = Max,
 Note
Output 9: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Voltage

Switching Characteristics
at VCC = +5.0V, TA = +25°C

II RL = 665Ω
Input Current @ Max
Symbol
Input Voltage Parameter Conditions CL = 15 pF Units
I Min Max
IH HIGH Level Input Current
I t
IL LOWPLH Propagation Delay
Level Input Current 100 ns
I t
OS ShortPHL
Circuit An to a –g 100
t
PLHCurrent
Output Propagation Delay 100 ns
I t
CC PHLCurrent
Supply RBI to a –g (Note 10) 100
Note 8: All typicalsNote
are at10:
V LT  HIGH, A0–A3  LOW

www.fairchildsemi.com
 SN54147, SN54148, SN54LS147,
SN54LS148 SN74147, SN74148 (TIM9907),
SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY
ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

’147, ’LS147 ’148, ’LS148

D Encode 10-Line Decimal to 4-Line BCD D Encode 8 Data Lines to 3-Line Binary
D Applications Include: (Octal)
− Keyboard Encoding D Applications Include:
− Range Selection − n-Bit Encoding
− Code Converters and Generators
SN54147, SN54LS147 . . . J OR W PACKAGE SN54148, SN54LS148 . . . J OR W PACKAGE
SN74147, SN74LS147 . . . D OR N PACKAGE SN74148, SN74LS148 . . . D, N, OR NS PACKAGE
(TOP VIEW) (TOP VIEW)

V V
CC
4 1 16 CC 4 1 16
5 2 15 NC 5 2 15 E0
6 3 14 D 6 3 14 GS
7 4 13 3 7 4 13 3
8 5 12 2 EI 5 12 2
C 6 11 1 A2 6 11 1
B 7 10 9 A1 7 10 0
GND 8 9 A GND 8 9 A0

SN54LS147 . . . FK PACKAGE SN54LS148 . . . FK PACKAGE

(TOP VIEW) (TOP VIEW)
VCC

VCC
NC

NC

NC

E0
5
4

3 2 1 20 19 3 2 1 20 19 GS
6 4 18 D 6 4 18
7 5 17 3 7 5 17 3
NC 6 16 NC NC 6 16 NC
8 7 15 2 EI 7 15 2
C 8 14 1 A2 8 14 1
9 10 11 12 13 9 10 11 12 13
GND

GND
NC

NC

A00
A1
B

A
9

NC − No internal connection

TYPICAL TYPICAL
TYPE DATA POWER
DELAY DISSIPATION
’147 10 ns 225 mW
’148 10 ns 190 mW
’LS147 15 ns 60 mW
’LS148 15 ns 60 mW

NOTE: The SN54147, SN54LS147, SN54148, SN74147, SN74LS147, and SN74148 are obsolete and are no longer supplied.
 Please be aware that an important notice concerning availability, standard warranty, and use in critical
applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this
data sheet.

PRODUCTION DATA information is current as of Copyright 2004, Texas Instruments Incorporated

publication date. Products conform to specifications per On products compliant to MIL PRF 38535, all parameters
the terms of Texas Instruments standard warranty. are tested unless otherwise noted. On all other products,
Production processing does not necessarily include production processing does not necessarily include testing
testing of all parameters. of all parameters.
POST OFFICE BOX 655303  DALLAS, TEXAS 75265 1
SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

’147, ’LS147 logic diagram (positive logic)

(11)
1

(12)
2
(9) A

(13)
3

(1)
4

(7)
B
(2)
5

(3)
6

(4) (6)
7 C

(5)
8

(14) D
9 (10)

Pin numbers shown are for D, J, N, and W packages.

POST OFFICE BOX 655303  DALLAS, TEXAS 75265

 SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

’148, ’LS148 logic diagram (positive logic)

(10)
0
(15)
EO

(14)
(11) G5
1

(12)
2

(9)
A0

(13)
3

(1)
4

(7)
A1
(2)
5

(3)
6

(4)
7 (6) A2

(5)
EI

Pin numbers shown are for D, J, N, NS, and W packages.

POST OFFICE BOX 655303  DALLAS, TEXAS 75265

 SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

†
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI: ’147, ’148 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
’LS147, ’LS148 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Inter-emitter voltage: ’148 only (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Package thermal impedance θJA (see Note 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W
NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Voltage values, except inter-emitter voltage, are with respect to the network ground terminal.
2. This is the voltage between two emitters of a multiple-emitter transistor. For ’148 circuits, this rating applies between any two of
the eight data lines, 0 through 7.
3. The package thermal impedance is calculated in accordance with JESD 51-7.

recommended operating conditions (see Note 4)

SN54’ SN74’ SN54LS’ SN74LS’
UNIT
MIN NOM MAX MIN NOM MAX MIN NOM MAX MIN NOM MAX
V
CC Supply voltage 4.5 5 5.5 4.75 5 5.25 4.5 5 5.5 4.75 5 5.25 V
I
OH High-level output current −800 −800 −400 −400 A
I
OL Low-level output current 16 16 4 8 mA
TA Operating free-air temperature −55 125 0 70 −55 125 0 70 C
NOTE 4: All unused inputs of the device must be held at V CC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)
† ’147 ’148
PARAMETER TEST CONDITIONS ‡ ‡ UNIT
MIN TYP MAX MIN TYP MAX
V
IH High-level input voltage 2 2 V
V
IL Low-level input voltage 0.8 0.8 V
V
IK Input clamp voltage VCC = MIN, II = −12 mA −1.5 −1.5 V
V VCC = MIN, VIH = 2 V,
OH High-level output voltage VIL = 0.8 V, IOH = −800 µA 2.4 3.3 2.4 3.3 V

V VCC = MIN, VIH = 2 V,

OL Low-level output voltage VIL = 0.8 V, IOL = 16 mA 0.2 0.4 0.2 0.4 V
Input current at maximum input
II VCC = MIN, VI = 5.5 V 1 1 mA
voltage

I High-level input 0 input 40

IH current Any input except 0 VCC = MAX, VI = 2.4 V 40 80 µA

I Low-level input 0 input −1.6

IL current Any input except 0 VCC = MAX, VI = 0.4 V −1.6 −3.2 mA
I §
OS Short-circuit output current VCC = MAX −35 −85 −35 −85 mA
I VCC = MAX Condition 1 50 70 40 60
CC Supply current (See Note 5) Condition 2 42 62 35 55 mA
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
All typical values are at VCC = 5 V, TA = 25°C.
§
Not more than one output should be shorted at a time.
NOTE 5: For ’147, ICC (Condition 1) is measured with input 7 grounded, other inputs and outputs open; ICC (Condition 2) is measured with all inputs and outputs open. For
’148, ICC (Condition 1) is measured with inputs 7 and EI grounded, other inputs and outputs open; ICC (Condition 2) is measured with all inputs and outputs
open.

SN54147, SN74147 switching characteristics, VCC = 5 V, TA = 255C (see Figure 1)

FROM TO TEST
PARAMETER WAVEFORM MIN TYP MAX UNIT
(INPUT) (OUTPUT) CONDITIONS
t
PLH 9 14
t Any Any In-phase output ns
PHL CL = 15 pF, 7 11
t RL = 400 Ω 13 19
PLH
t Any Any Out-of-phase output ns
PHL 12 19

POST OFFICE BOX 655303  DALLAS, TEXAS 75265

 SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

SN54148, SN74148 switching characteristics, VCC = 5 V, TA = 255C (see Figure 1)

† FROM TO TEST
PARAMETER (INPUT) (OUTPUT) WAVEFORM CONDITIONS MINTYPMAX UNIT
t
PLH 10 15
t 1–7 A0, A1, or A2 In-phase output ns
PHL 9 14
t
PLH 13 19
t 1–7 A0, A1, or A2 Out-of-phase output ns
PHL 12 19
t
PLH 6 10
t 0–7 EO Out-of-phase output ns
PHL 14 25
t
PLH CL = 15 pF, 18 30
0–7 GS In-phase output ns
t RL = 400 Ω 14 25
PHL
t
PLH 10 15
t EI A0, A1, or A2 In-phase output ns
PHL 10 15
t
PLH 8 12
t EI GS In-phase output ns
PHL 10 15
t
PLH 10 15
t EI EO In-phase output ns
PHL 17 30
† tPLH = propagation delay time, low-to-high-level
output. tPHL = propagation delay time, high-to-low-level
output.

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)
SN54LS’ SN74LS’
† ‡ ‡
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
V
IH High-level input voltage 2 2 V
V
IL Low-level input voltage 0.7 0.8 V
V
IK Input clamp voltage VCC = MIN, II = −18 mA −1.5 −1.5 V
V VCC = MIN, VIH = 2 V,
OH High-level output voltage V
IL = 0.8 V, IOH = −400 µA 2.5 3.4 2.7 3.4 V
VCC = MIN, I= 4 mA 0.25 0.4 0.25 0.4
OL
V
OL Low-level output voltage VIH = 2 V, IOL = 8 mA 0.35 0.5 V
V = V MAX
IL IL

Input current at ’LS148 inputs 1–7 0.2 0.2

II maximum input VCC = MAX, VI = 7 V mA
voltage All other inputs 0.1 0.1

I High-level input ’LS148 inputs 1–7 40 40

IH current All other inputs VCC = MAX, VI = 2.7 V 20 20 µA

I Low-level input ’LS148 inputs 1–7 −0.8 −0.8

IL current All other inputs VCC = MAX, VI = 0.4 V −0.4 −0.4 mA
I §
OS Short-circuit output current VCC = MAX −20 −100 −20 −100 mA
I VCC = MAX Condition 1 12 20 12 20
CC Supply current (See Note 6) Condition 2 10 17 10 17 mA
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
All typical values are at VCC = 5 V, TA = 25°C.
§
Not more than one output should be shorted at a time.
NOTE 6: For ’LS147, ICC (Condition 1) is measured with input 7 grounded, other inputs and outputs open; I CC (Condition 2) is measured with all inputs and
outputs open. For ’LS148, ICC (Condition 1) is measured with inputs 7 and EI grounded, other inputs and outputs open; I CC (Condition 2) is
measured with all inputs and outputs open.
POST OFFICE BOX 655303  DALLAS, TEXAS 75265
SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10 LINE TO 4 LINE AND 8 LINETO 3 LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004

SN54LS147, SN74LS147 switching characteristics, VCC = 5 V, TA = 255C (see Figure 2)

FROM TO TEST
PARAMETER WAVEFORM MIN TYP MAX UNIT
(INPUT) (OUTPUT) CONDITIONS
t
PLH 12 18
t Any Any In-phase output ns
PHL CL = 15 pF, 12 18
t RL = 2 kΩ 21 33
PLH
t Any Any Out-of-phase output ns
PHL 15 23

SN54LS148, SN74LS148 switching characteristics, VCC = 5 V, TA = 255C (see Figure 2)

† FROM TO TEST
PARAMETER (INPUT) (OUTPUT) WAVEFORM CONDITIONS MIN TYP MAX UNIT
t
PLH 14 18
t 1–7 A0, A1, or A2 In-phase output ns
PHL 15 25
t
PLH 20 36
t 1–7 A0, A1, or A2 Out-of-phase output ns
PHL 16 29
t
PLH 7 18
t 0–7 EO Out-of-phase output ns
PHL 25 40
t
PLH CL = 15 pF, 35 55
0–7 GS In-phase output ns
t RL = 2 kΩ 9 21
PHL
t
PLH 16 25
t EI A0, A1, or A2 In-phase output ns
PHL 12 25
t
PLH 12 17
t EI GS In-phase output ns
PHL 14 36
t
PLH 12 21
t EI EO In-phase output ns
PHL 23 35
† tPLH = propagation delay time, low-to-high-level
output tPHL = propagation delay time, high-to-low-level output

POST OFFICE BOX 655303  DALLAS, TEXAS 75265

Codificadores en cascada
La figura nos muestra la conexión que debemos llevar a cabo para conectar los
codificadores en cascada